U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 8725685 PUBLICATION DATE: 04/27/2012
Name: CUTOFF SOUTH
FL
NOAA Chart: 11426 Latitude: 26° 51.3' N ( 26.85500)
USGS Quad: PLACIDA Longitude: 82° 18.2' W ( -82.30330)
To reach the tidal bench marks at the southern end of Lemon Bay, proceed 10.5 km
(6.5 mi) south along State Road 775 (Alternate 45) from Englewood, to a dirt
road, continue west on the dirt road to the end and the Born residence. The
gage site was at the wood pier and the bench marks are in the near area.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5685 A 1977
DESIGNATION: 872 5685 A
MONUMENTATION: Tidal Station disk VM#: 7384
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7811
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 26° 51.4' N ( 26.85600) LONGITUDE: 82° 18.2' W ( -82.30286)
The primary bench mark is a disk located 6 m (20 ft) SW of the SW corner of a
porch attached to the dwelling, 4.27 m (14.0 ft) NNW of the end of the dock and
1.52 m (5.0 ft) NE of the shoreline. The bench mark is crimped to a 5/8 inch
diameter copper-coated steel rod driven 7.32 m (24.0 ft) and encased in a PVC
protector pipe and concrete.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 8725685 PUBLICATION DATE: 04/27/2012
Name: CUTOFF SOUTH
FL
NOAA Chart: 11426 Latitude: 26° 51.3' N ( 26.85500)
USGS Quad: PLACIDA Longitude: 82° 18.2' W ( -82.30330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5685 B 1977
DESIGNATION: 872 5685 B
MONUMENTATION: Tidal Station disk VM#: 7385
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7807
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 26° 51.4' N ( 26.85600) LONGITUDE: 82° 18.2' W ( -82.30286)
The bench mark is a disk located 19 m (62 ft) WSW of the SW corner of the
dwelling, 18.29 m (60.0 ft) NW of Bench Mark 5685 A 1977, 3 m (10 ft) NE of the
shoreline and 0.15 m (0.5 ft) north of a witness post. The bench mark is
crimped to a 5/8 inch copper-coated steel rod driven 7.32 m (24.0 ft) and
encased in a PVC protector pipe and concrete.
BENCH MARK STAMPING: 5685 E 1977
DESIGNATION: 872 5685 E
MONUMENTATION: Tidal Station disk VM#: 7387
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7808
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 26° 51.4' N ( 26.85631) LONGITUDE: 82° 18.2' W ( -82.30311)
The bench mark is a disk located 20 m (66 ft) WSW of Bench Mark 5685 C 1977, 17
m (56 ft) NNW of Bench Mark 5685 B 1977, 2.44 m (8.0 ft) north of the shoreline
and 0.15 m (0.5 ft) north of a witness post. The bench mark is crimped to a 5/8
inch copper-coated steel rod driven 7.32 m (24.0 ft) and encased in a PVC
protector pipe and concrete.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 8725685 PUBLICATION DATE: 04/27/2012
Name: CUTOFF SOUTH
FL
NOAA Chart: 11426 Latitude: 26° 51.3' N ( 26.85500)
USGS Quad: PLACIDA Longitude: 82° 18.2' W ( -82.30330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5685 G 2008
DESIGNATION: 872 5685 G
MONUMENTATION: Flange-encased Rod VM#: 19973
AGENCY: National Geodetic Survey (NGS)C IDB PID#: DM3213
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID#: DM3213
LATITUDE: 26° 51.4' N ( 26.85589) LONGITUDE: 82° 18.2' W ( -82.30264)
The bench mark is a flange encased rod located 25.7 m (84.3 ft) south of a
fishing pier, 21.9 m (71.8 ft) south of a wooden state park sign, 21.5 m (70.6
ft) SE of the approximate centerline of the Don Pedro State Park entrance road,
and 0.8 m (2.6 ft) north of a carsonite witness post.
BENCH MARK STAMPING: 5685 H 2008
DESIGNATION: 872 5685 H
MONUMENTATION: Tidal Station disk VM#: 19974
AGENCY: Florida Dept. of Environmental
Protection (FLDEP) IDB PID#: DM3212
SETTING CLASSIFICATION: Concrete pavement OPUS PID:
LATITUDE: 26° 51.4' N ( 26.85736) LONGITUDE: 82° 18.0' W ( -82.30064)
The bench mark is a disk located 16.4 m (53.7 ft) west of the SW corner of a
restroom building, 15.8 m (51.7 ft) north of the Don Pedro State Park entrance
road, 2.5 m (8.2 ft) east of a carsonite witness post, 0.4 m (1.3 ft) SW of the
SW column of the picnic shelter, and 0.3 m (0.9 ft) NE of the SW corner of the
concrete slab.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 8725685 PUBLICATION DATE: 04/27/2012
Name: CUTOFF SOUTH
FL
NOAA Chart: 11426 Latitude: 26° 51.3' N ( 26.85500)
USGS Quad: PLACIDA Longitude: 82° 18.2' W ( -82.30330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: CHA 11 1983
DESIGNATION: CHA 11
MONUMENTATION: Survey disk VM#: 19975
AGENCY: Florida Dept. of Environmental
Protection (FLDEP) IDB PID#:
SETTING CLASSIFICATION: Concrete culvert headwall OPUS PID:
LATITUDE: 26° 51.9' N ( 26.86500) LONGITUDE: 82° 18.0' W ( -82.30064)
The bench mark is a disk set in the center of a culvert headwall, bearing 8.44 m
(27.7 ft) east-NE of the centerline of State Road 775, 123 feet north-NW of the
extended centerline of a private drive, 32.98 m (108.2 ft) NW of power pole
5-3033-1195-07, and 0.82 m (2.7 ft) SSE of a witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 8725685 PUBLICATION DATE: 04/27/2012
Name: CUTOFF SOUTH
FL
NOAA Chart: 11426 Latitude: 26° 51.3' N ( 26.85500)
USGS Quad: PLACIDA Longitude: 82° 18.2' W ( -82.30330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: CHA 12 1983
DESIGNATION: CHA 12
MONUMENTATION: Survey disk VM#: 19976
AGENCY: Florida Dept. of Environmental
Protection (FLDEP) IDB PID#:
SETTING CLASSIFICATION: Concrete culvert headwall OPUS PID:
LATITUDE: 26° 51.5' N ( 26.85753) LONGITUDE: 82° 17.8' W ( -82.29717)
The bench mark is a disk set in the top center of a culvert headwall, bearing
13.11 m (43 ft) SW of the centerline of the road, 19.84 m (65.1 ft) SE of
telephone box 392, 28.5 m (93.5 ft) SSW, across the highway from a power pole,
1.92 m (6.3 ft) NW of a witness post, and above level with the centerline of
road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 8725685 PUBLICATION DATE: 04/27/2012
Name: CUTOFF SOUTH
FL
NOAA Chart: 11426 Latitude: 26° 51.3' N ( 26.85500)
USGS Quad: PLACIDA Longitude: 82° 18.2' W ( -82.30330)
T I D A L D A T U M S
Tidal datums at CUTOFF SOUTH based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: March 1978 - May 1978
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8725110 NAPLES, GULF OF MEXICO
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.454
North American Vertical Datum NAVD88 = 0.385
MEAN HIGH WATER MHW = 0.377
MEAN SEA LEVEL MSL = 0.241
MEAN TIDE LEVEL MTL = 0.238
MEAN LOW WATER MLW = 0.099
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5685 A 1977 0.721 0.344
5685 B 1977 0.813 0.436
5685 E 1977 0.866 0.489
5685 G 2008 0.685 0.308
5685 H 2008 1.533 1.156
CHA 11 1983 1.298 0.921
CHA 12 1983 1.842 1.465
Foot Notes:
Geodetic heights of the bench marks meet all NOAA/NOS/NGS quality control
standards for Second Order, Class 1 leveling. It is advised that a confirmation
set of levels be established for bench marks 5685 G 2008, 5685 H 2008, CHA 11
1983, and CHA 12 1983 to verify height differences before using tidal bench mark
elevation information.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 8725685 PUBLICATION DATE: 04/27/2012
Name: CUTOFF SOUTH
FL
NOAA Chart: 11426 Latitude: 26° 51.3' N ( 26.85500)
USGS Quad: PLACIDA Longitude: 82° 18.2' W ( -82.30330)
D E F I N I T I O N S
Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal
Datum Epoch. It pertains to local mean sea level and should not be confused
with the fixed datums of North American Vertical Datum of 1988 (NAVD88).
NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum
constraint adjustment of Canadian/Mexican/United States leveling observations.
Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as
the single initial constraint. NAVD88 replaces NGVD29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD29 was originally derived from a general
adjustment of the first-order leveling networks of the U.S. and Canada after
holding mean sea level observed at 26 long term tide stations as fixed.
Numerous local and wide-spread adjustments have been made since establishment in
1929. Bench mark elevations relative to NGVD29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to
local MSL and other tidal datums may not be consistent from one location to
another.
The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique
identifiers for bench marks in the tidal and geodetic databases, respectively.
Each bench mark in either database has a single, unique VM# and/or PID# assigned.
Where both VM# and PID# are indicated, both tidal and geodetic elevations are
available for the bench mark listed. The NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.
The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD88 elevations.
The NAVD88 elevation relationship shown in the table is derived from an average
of several bench mark elevations relative to tide station datum. As a result of
this averaging, NAVD88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD88 elevations listed for
each bench mark in the NGS database.